CollarSafe 1" Wide Designer Patterned Polyester Replacement Collar -Fits Most (not All) modules requiring 2 Holes (1-3/16" Apart on Center) for Some PetSafe & Others (See Description). Patterned Polyester Material - CollarSafe's Strongest Replacement Collar Fits most (not all) 2-Hole Receiver Modules measuring 1-3/16" on center (wireless containment, electric fence, training/bark systems, Petsafe, Innotek, Dogtek, Invisible Fence (note: will NOT fit R21, R22 & R51 models, see my other listing) Width: 1 inch - Length: adjusts up to 30" neck (EASILY customizable shorter by customer-see included instructions) - Thickness: approx .078" or 2.02mm - Tensile Strength: 5,300 lbs - UV, rot, mildew, moisture resistant, pattern printed on both sides of material (Note: these may be too thick/heavy for smaller petite dogs) These are NOT traditional dog collars and do NOT have "D" rings or any metal which may interfere with RF signals Custom Designed & MADE IN USA by Collar-Safe and features minimal or no retail packaging